package com.yyplatform.admin.platform.monitor.service.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import org.springframework.stereotype.Service;

import com.yyplatform.admin.platform.monitor.model.CpuDTO;
import com.yyplatform.admin.platform.monitor.model.JvmDTO;
import com.yyplatform.admin.platform.monitor.model.MemDTO;
import com.yyplatform.admin.platform.monitor.model.ServerMonitorDTO;
import com.yyplatform.admin.platform.monitor.model.SysIoDTO;
import com.yyplatform.admin.platform.monitor.model.SystemDTO;
import com.yyplatform.admin.platform.monitor.service.ServerMonitorService;
import com.yyplatform.admin.platform.monitor.utils.Arith;
import com.yyplatform.admin.platform.monitor.utils.IpUtils;

import lombok.extern.slf4j.Slf4j;
import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;
import oshi.hardware.CentralProcessor.TickType;
import oshi.hardware.GlobalMemory;
import oshi.hardware.HardwareAbstractionLayer;
import oshi.software.os.FileSystem;
import oshi.software.os.OSFileStore;
import oshi.software.os.OperatingSystem;
import oshi.util.Util;

/**
 * Created on 2025-04-17
 */
@Service
@Slf4j
public class ServerMonitorServiceImpl implements ServerMonitorService {
    private static final int OSHI_WAIT_SECOND = 1000;


    @Override
    public ServerMonitorDTO getServerMonitor() {

        ServerMonitorDTO serverMonitorDTO = new ServerMonitorDTO();
        SystemInfo systemInfo = new SystemInfo();
        HardwareAbstractionLayer hal = systemInfo.getHardware();

        CpuDTO cpuDTO = getCpuInfo(hal.getProcessor());
        serverMonitorDTO.setCpu(cpuDTO);

        MemDTO memDTO = getMemInfo(hal.getMemory());
        serverMonitorDTO.setMem(memDTO);

        SystemDTO systemDTO = getSysInfo();
        serverMonitorDTO.setSys(systemDTO);

        JvmDTO jvmDTO = getJvmInfo();
        serverMonitorDTO.setJvm(jvmDTO);


        List<SysIoDTO> fileDTOList = getFileInfo(systemInfo.getOperatingSystem());
        serverMonitorDTO.setSysFiles(fileDTOList);


        return serverMonitorDTO;
    }

    private List<SysIoDTO> getFileInfo(OperatingSystem os) {
        List<SysIoDTO> sysFiles = new ArrayList<>();

        FileSystem fileSystem = os.getFileSystem();
        List<OSFileStore> fsArray = fileSystem.getFileStores();
        for (OSFileStore fs : fsArray) {
            long free = fs.getUsableSpace();
            long total = fs.getTotalSpace();
            long used = total - free;
            SysIoDTO sysFile = new SysIoDTO();
            sysFile.setDirName(fs.getMount());
            sysFile.setSysTypeName(fs.getType());
            sysFile.setTypeName(fs.getName());
            sysFile.setTotal(convertFileSize(total));
            sysFile.setFree(convertFileSize(free));
            sysFile.setUsed(convertFileSize(used));
            sysFile.setUsage(Arith.mul(Arith.div(used, total, 4), 100));
            sysFiles.add(sysFile);
        }

        return sysFiles;
    }

    private String convertFileSize(long size) {
        long kb = 1024;
        long mb = kb * 1024;
        long gb = mb * 1024;
        if (size >= gb) {
            return String.format("%.1f GB", (float) size / gb);
        } else if (size >= mb) {
            float f = (float) size / mb;
            return String.format(f > 100 ? "%.0f MB" : "%.1f MB", f);
        } else if (size >= kb) {
            float f = (float) size / kb;
            return String.format(f > 100 ? "%.0f KB" : "%.1f KB", f);
        } else {
            return String.format("%d B", size);
        }
    }


    private JvmDTO getJvmInfo() {
        JvmDTO jvm = new JvmDTO();
        Properties props = System.getProperties();
        jvm.setTotal(Runtime.getRuntime().totalMemory());
        jvm.setMax(Runtime.getRuntime().maxMemory());
        jvm.setFree(Runtime.getRuntime().freeMemory());
        jvm.setVersion(props.getProperty("java.version"));
        jvm.setHome(props.getProperty("java.home"));
        return jvm;
    }


    private SystemDTO getSysInfo() {
        SystemDTO sys = new SystemDTO();
        Properties props = System.getProperties();
        sys.setComputerName(IpUtils.getHostName());
        sys.setComputerIp(IpUtils.getHostIp());
        sys.setOsName(props.getProperty("os.name"));
        sys.setOsArch(props.getProperty("os.arch"));
        sys.setUserDir(props.getProperty("user.dir"));
        return sys;
    }


    private MemDTO getMemInfo(GlobalMemory memory) {
        MemDTO mem = new MemDTO();
        mem.setTotal(memory.getTotal());
        mem.setUsed(memory.getTotal() - memory.getAvailable());
        mem.setFree(memory.getAvailable());
        return mem;
    }

    //
    //
    private CpuDTO getCpuInfo(CentralProcessor processor) {
        CpuDTO cpu = new CpuDTO();

        // CPU信息
        long[] prevTicks = processor.getSystemCpuLoadTicks();
        Util.sleep(OSHI_WAIT_SECOND);
        long[] ticks = processor.getSystemCpuLoadTicks();
        long nice = ticks[TickType.NICE.getIndex()] - prevTicks[TickType.NICE.getIndex()];
        long irq = ticks[TickType.IRQ.getIndex()] - prevTicks[TickType.IRQ.getIndex()];
        long softirq = ticks[TickType.SOFTIRQ.getIndex()] - prevTicks[TickType.SOFTIRQ.getIndex()];
        long steal = ticks[TickType.STEAL.getIndex()] - prevTicks[TickType.STEAL.getIndex()];
        long cSys = ticks[TickType.SYSTEM.getIndex()] - prevTicks[TickType.SYSTEM.getIndex()];
        long user = ticks[TickType.USER.getIndex()] - prevTicks[TickType.USER.getIndex()];
        long iowait = ticks[TickType.IOWAIT.getIndex()] - prevTicks[TickType.IOWAIT.getIndex()];
        long idle = ticks[TickType.IDLE.getIndex()] - prevTicks[TickType.IDLE.getIndex()];
        long totalCpu = user + nice + cSys + idle + iowait + irq + softirq + steal;
        cpu.setCpuNum(processor.getLogicalProcessorCount());
        cpu.setTotal(totalCpu);
        cpu.setSys(cSys);
        cpu.setUsed(user);
        cpu.setWait(iowait);
        cpu.setFree(idle);

        return cpu;
    }

}
